11978117563 has 8 divisors (see below), whose sum is σ = 12180492720. Its totient is φ = 11775936480.

The previous prime is 11978117549. The next prime is 11978117609. The reversal of 11978117563 is 36571187911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11978117563 - 2⁵ = 11978117531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978117513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78756 + ... + 173662.

It is an arithmetic number, because the mean of its divisors is an integer number (1522561590).

Almost surely, 2^11978117563 is an apocalyptic number.

11978117563 is a deficient number, since it is larger than the sum of its proper divisors (202375157).

11978117563 is an equidigital number, since it uses as much as digits as its factorization.

11978117563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97037.

The product of its digits is 317520, while the sum is 49.

The spelling of 11978117563 in words is "eleven billion, nine hundred seventy-eight million, one hundred seventeen thousand, five hundred sixty-three".